hg: build-infra/jdk9: Enable mapfile on windows but don't add it to LDFLAGS

[ingemar.aberg at oracle.com]

Changeset: 9873631d6cc3
Author:    iaberg
Date:      2015-04-21 10:06 +0200
URL:       http://hg.openjdk.java.net/build-infra/jdk9/rev/9873631d6cc3

Enable mapfile on windows but don't add it to LDFLAGS

! make/common/NativeCompilation.gmk